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United States Patent | 5,277,878 |
Piotrowski ,   et al. | January 11, 1994 |
A reactor for carrying out heterogeneous-phase reactions, in particular gas/liquid reactions with a continuous liquid phase and a dispersed (discontinuous) gas phase, is described, in which, in a horizontal plane, a substantially vertically upward-directed flow of the reaction medium takes place in a first region of the reactor cross-section and a substantially vertically downward-directed flow takes place in another region of the reactor having a device for dispersing the discontinuous phase such as a dispersing screen, substantially only in the regions with upward-directed flow. The reactor is here designed in such a way that free flow of the reaction medium from regions with downward-directed flow to regions with upward-directed flow is possible in the region of the dispersing device. The preferred use of the proposed reactor is the exothermic oxidation of p-xylene and monomethyl p-toluate with air in the so-called Witten DMT process.
Inventors: | Piotrowski; Bernhard (Lohmar, DE); Korte; Hermann-Josef (Haltern, DE) |
Assignee: | Huels Aktiengesellschaft (Marl, DE) |
Appl. No.: | 889339 |
Filed: | May 28, 1992 |
May 29, 1991[DE] | 4117592 |
Current U.S. Class: | 422/129; 261/36.1; 261/121.1; 261/124; 261/153; 422/198; 422/200; 422/224; 422/231; 422/234 |
Intern'l Class: | B01J 010/00 |
Field of Search: | 422/198,202,201,231,234,285,288,290,224,129 261/153,36.1,121.1,124 34/22 55/93,94,90,89 210/456,188,180 435/316,313,314 |
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3759669 | Sep., 1973 | Aaron et al. | 422/231. |
3846079 | Nov., 1974 | Alagy et al. | 261/36. |
3927987 | Dec., 1975 | Winter, III et al. | 422/200. |
4146578 | Mar., 1979 | Brennan et al. | 423/473. |
4275032 | Jun., 1981 | Anderson | 422/224. |
4342876 | Aug., 1982 | Klingman | 422/231. |
4545945 | Oct., 1985 | Prave et al. | 422/231. |
4672142 | Jun., 1987 | Hundeck et al. | 570/247. |
4844876 | Jul., 1989 | Oliveau et al. | 55/93. |
Foreign Patent Documents | |||
0075742 | Sep., 1982 | EP. |